吸附-解吸气相色谱法测定空气中氯乙烯时,采样结束后,用胶帽密封采样管两端,存放在()中待测。
参考答案:冰箱
I think I’m not the kind of person ________ likes to sharing everything with others.
A what B which C who D when
中国民族工业发展的“黄金时期”是指
A.一战期间
B.甲午战后
C.19世纪六七十年代
D.北洋军阀统治时期